Electric lamp



1,623,761 Aprll 5, 1927' F. SKAUPY v ELECTRIC LAMP Filed Dec, 11, 1922 Invent or Franz Skaupy,

His Attorney Patented Apr. 5}1927;

FRANZ SKAUPY, F BERLIN, GERMANY,

ASSIGNOR TO GENERAL ELECTRIC COMPANY,

A CORPORATION OF NEW YORK.

' ELECTRIC LAMP.

Application filed December 11, 1922, Serial No. 606,173, and in Germany December 21, 1921.

My invention relates to electric glow lamps. It relates for cxmuple to glow lamps in which a current conveying metallic light-- ing element which may be tun-gsteu'or the like is mounted or sprcadon a suitable support.- j I Heretofore. in lumps of the above type, the support element has been of a refractory material which is a nonwonductor of heat or at best a poor conductor and which is nontransparent. Thorium oxide has sometimes been used for this support. .Suchlamps of the prior art have been inefficient because of the great losses due to convection inasmuch as these lamps are provided with gases.

My invention contemplates having the support element made of transparent material which will convey sulficient heat to the lightgiving element mounted thereon to make the element luminous and yet the body on which the element is mounted does not interfere materially with the radiation of the light giving element enabling the light giving element to stand out.

My invention also contemplates the pro duction of a lamp which consumes a much smaller portion of current than similar lamps have heretofore consumed to accomplish a given result. The lamps of the prior art have been very inefficient because the opaque body upon which the luminous element is mounted, being comparatively large, causes a large amount of loss due to convection and black radiation, so called.

a My invention also contemplates other details of improvement tending to increase the efiicienc and serviceability of a lamp of the above 0 iaracter.

Themeans for accomplishing the foregoing ends are hereinafter more fully disclosed and claimed.

Referring to the accompanying drawing, Fig. 1 shows one of the lampsof my invention in elevation; Fig. 2 shows a modified construction of the lamp.

The metallic light emitting element can be spread over the transparent support in any suitable'form, as for example, in the form of hands, letters, figures or the like. In order to obtain a coating of the light emitting element in any particular form any one of the various known methods may be used such as, for example, the cathode atomization method. In such cases a stencil provided with corresponding openings isplaced electrically connected with the over the transparent support during the atomization with the result that a coating is produced on the transparent support conforming to the form of a stencil. Special 'etl'ccts can be obtained if the metallic confore the transparent support is heated to approximately the same temperature as the current traversed conductor, Therefore, other sections oi metallic light emitting material may be mounted on the transparent body and although not traversed byman electric current, will nevertheless lightup as a result of the heat conduction through the transparent body. Such a construction is shown in Fig. 1. In this figure I'show a globe a similar to the ordinary incandescent lamp globe. In 'the interior there is provided a base I) through which the inlet wires 0 pass in the usual manner. The current inlet wires 0 serve at the same time to hold the rectangular transparent plate at which carries the current metallic lighting element 0. This element e is in the form of a rectangular frame and may consist of tungsten. lVithin the frame there is arranged on the surface of the plate 03 another metallic coating f which appears in the form of the word ()sram. This section of the coating is not frame nor with the electric circuit. In the operation of the lamp, the coating e not only emits light, but also serves to heat the support plate (I which does not light up or which, if it lights at all, does so to a very small degree. As a result, the coating f stands out as an illuminated word.

In the form of lamp shown in Fig. 2, the transparent support which is held by the current inlet wires 0 consists of a small rod 1 on which is wound, in helical form, a wirelike conductor'h of tungsten, for example. The transparent support may be made either of glass or of any transparent material consisting of one or a few crystals. The following substances. for example, may he used: the diflicultly fusible oxides such as thorium oxide, quartz and the like; also the nitrate or carbide of thorium.

It will be seen, therefore, that, I provide a glow lamp which is highly efiicient inasmuch as the heat losses due to convection are reduced to a minimum and in which the light emitting element stands out without being hlurred to any material extent by light emanating from the supporting ele ment. Such a lamp therefore is not only efiicient as an electric sign or the like but is also economical in its operation inasmuch as it consumes a comparatively small amount of current.

What I claim as new and desire to secure hy Letters Patent of the United States, is:

t. In an electric glow lamp, in combina-- tion, a support. a heating element and a lightemitting element; on salt support, raid heating element adapted to be heated to incandesceuce hy current from a suitable source Wlwrehy the support may be heated, said support serving in turn as a heating element ior the light emitting element to cause the latter to glow, said support heing transparentand having a niacroerystalline structure.

2. Ina glow lamp. a transparent support, a light emitting body isolated on said support, independent means for heating the transparent hody whereby the latter in turn may heat the isolated body to cause the latter to emit light.

3. ln av glo lamp, a transparent support, a light emittinghody isolated on said support, independent means for heating the transparent holly whereby the latter in turn may heat the isolated body to cause the latter to emit li ht. said transparent body being nun-roe illine.

In witness in :rco'f, I have hereunto set my hand 21st day of l'lovemher,

lilii -Ala F3. to 1%: All? ill 

